Sealing composition.



- 1.. as PATENT JOHN c. ramarnnno, or BALTIMORE, MARYLAND.

. snamne comrosrrron.

No Drawing.

To all whom it may concern:

Be it known that I, JOHN C. TALIAFERRO,

a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Sealing Compositions, of which the following is a description.

The invention relates to new and useful improvements in sealing compositions, more 1 especially for use in connection with the manufacture of the well known double seam or sanitary cans.

An object of the invention is to provide. a sealing substance which may be readily applied to a can end without the throwing off of volatile products, which may be more or less poisonous or objectionable.

To this end, the invention consists in providing a sealing substance which 'is plastic 2 at ordinary temperatures, but which may be liquefied under heat, so that said substance may be applied to the can end while heated, and as soon as the substance cools, a coating of a non-volatile plastic adhesive material is secured, which is subsequently'rolled in the seam or joint, thus forming a hermetic joint. I

A further object of the invention is to provide a sealing substance which is not 0 materially affected by exposure to air. I accomplish this object by using materials in the formation of my sealing composition, which materials are non-volatile in character, and not affected by air, and consequently a coating of my sealing material when applied to a can end does not deteriorate if a considerable period of time elapses before said end with the coating thereon is attached to the can body.

A still further object of the invention is .to provide a non-volatile plastic adhesive sealing material, which is comparatively soft at ordinary temperatures, and which may be readily liquefied by heat, so that the same 4 may be applied in a thin layer to the part of the can end that is to be subsequently rolled into the joint.

While it is necessary that the sealing substance shall have the above characteristics, 80 in order to be efficiently applied and used for the purpose described, 1t is also equally necessary that said substance will be adhesive and cementing in character, in order that a tight joint may be produced. It is 55 also necessary that the sealing substance shall resist corrosive food acids, and be Specification of Letters JEatent.

Patented July as, 1am.

Application filed. December 8, 1909. Serial No. 532,053.

harmless, substantially tasteless, and free from odor.

I have found that the most suitable base for a composition having the characteristics above mentioned, is a prepared semi-solid sap of certain plants or trees containing a gum closely resembling rubber, and a resinous substance in quantities suflicient to prevent or protract the oxidization of the gum. One substance of this character is known in the trade as Pontianac rubber. This contains from 10 to 15% of a gum closely resembling rubber, and from to of resin, the remainder of the substance consisting largely of impurities. Another substance of this character is known in the trade as Gantella .gum. This contains from 80 to 90% of a gum closely resembling rubber, and 10 to 20% of resin.

I have found that a sealing composition consisting entirely of either of the above base substances, is slightly sticky when applied as a coating, and, therefore, partly for the purpose of rendering said coating less adhesive, and partly for thepurpose of time ing the base substance, I add thereto from 5% to 15% of a permanent flux, such as wax, preferablya hard parafiin wax. The wax gives to the coating a smooth, substantially hard surface, which protects the same. It is also sometimes desirable to add to the composition, asbestos or some similar material, inorder to give body to the mixture. From--10% to 30% of ground pure asbestos is preferably used, and this is added to the mixture when said mixture is in a melted condition.

It will be understood that the proportions of the various ingredients may be varied without departing from the spirit of my invention. It will also be understood that other substances besides Pontianac rubber or Oantella gum, may be used, provided said substances contain a certain per cent. of gum and a certain per cent. of

abietic acid. V

The composition above described is plastic at ordinary temperatures, but-by the application of varylng degrees of heat, up to 300 F., its viscosity may be changed. It is non volatile and gives off no odors. It is practically tasteless, and has no injurious effects upon the contents of the cans. It is not affected by the food acids, and consequently the contents of the cans do not in any way afi'ect its sealing qualities.

Having thus described my invention, what claim as new and desire to secure by Letters Patent, is

1. A plastic sealing material consisting of a semi-solid sap, containing a gum closely resembling rubber and a resinous substance in quantities sufficient to prevent or protract the oxidization of the rubber, and a permanent flux.

2.- A plastic sealing material consisting of a semi-solid sap, containing a gum closely resembling rubber and a resinous substance in quantity suflicient to revent or protract the oxidization of the rubber, and a parafiin wax.

3. A plastic sealing material, consisting of a semi-solid sap, containing a gum closely 4. A plastic sealing material consisting of from 55 to 85 parts of a semi-solid sap, containing a gum closely resembling rubber and a resinous substance in quantity sufiicient to prevent or protract the oxidization of the rubber, 5 to 15 parts of paraflin wax, and from 10 to 30 parts of asbestos.

In testimony whereof I aflix my signature, in presence of two witnesses.

. JOHN C. TALIAFERRO. Witnesses:

FRANK SCHNEIDER, H. SCHUTZ. 

